问题
选择题
Doing enough exercise _____ our health. [ ]
A. is good for
B. is good to
C. are good for
D. are good at
答案
答案：A
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Doing enough exercise _____ our health. [ ]
A. is good for
B. is good to
C. are good for
D. are good at
答案：A
SO2 
2CO2 
2H2O 
CO2+H2O